<template>
  <div>
    <div class="shopcart">
      <div class="content">
        <div class="content-left" @click="togglefold">
          <div class="logo-wrapper">
            <div class="logo" :class="{'highlight':totalCount>0}">
              <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
            </div>
            <div class="num" v-show="totalCount>0">{{totalCount}}</div>
          </div>
          <div class="price" :class="{'highlight':totalPrice>0}">&yen;{{totalPrice}}</div>
          <div class="desc">另需配送费&yen;{{deliveryPrice}}元</div>
        </div>
        <div class="content-right" @click.stop.prevent="pay">
          <div class="pay" :class="payClass">
            {{payDes}}
          </div>
        </div>
        <div class="ball-container">
          <div v-for="ball in balls">
            <transition name="drop" @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
              <div v-show="ball.show" class="ball">
                <div class="inner inner-hook"></div>
              </div>
            </transition>
          </div>
        </div>
        <transition name="fold">
          <div class="cart-detail" v-show="listshow">
            <div class="list-header clearfix border-1px">
              <div class="left-text">购物车</div>
              <div class="right-text" @click="empty">清空</div>
            </div>
            <div class="list-food" ref="listfood">
              <ul>
                <li v-for="selectfood in selectFoods" class="select-item border-1px">
                  <h1 class="name">{{selectfood.name}}</h1>
                  <span class="price">&yen;{{selectfood.price*selectfood.count}}</span>
                  <div class="cartcontrol-wrapper">
                    <cartcontrol :food="selectfood"></cartcontrol>
                  </div>
                </li>
              </ul>
            </div>
          </div>
        </transition>
      </div>
    </div>
    <transition name="fade">
      <div class="openmask" v-show="listshow" @click="hideList"></div>
    </transition>
  </div>
</template>

<script>
import cartcontrol from '../cartcontrol/cartcontrol';
import BScroll from 'better-scroll';

export default {
  props: {
    selectFoods: {
      type: Array,
      default() {
        return [
        ];
      }
    },
    deliveryPrice: {
      type: Number,
      default: 0
    },
    minPrice: {
      type: Number,
      default: 0
    }
  },
  data() {
    return {
      balls: [
        {
          show: false
        },
        {
          show: false
        },
        {
          show: false
        },
        {
          show: false
        },
        {
          show: false
        }
      ],
      dropBalls: [],
      fold: true
    };
  },
  computed: {
    totalPrice() {
      let total = 0;
      this.selectFoods.forEach((food) => {
        total += food.price * food.count;
      });
      return total;
    },
    totalCount() {
      let count = 0;
      this.selectFoods.forEach((food) => {
        count += food.count;
      });
      return count;
    },
    payDes() {
      if (this.totalPrice === 0) {
        return `¥${this.minPrice}元起送`;
      } else if (this.totalPrice < this.minPrice) {
        let diff = this.minPrice - this.totalPrice;
        return `还差¥${diff}元起送`;
      } else {
        return '去结算';
      }
    },
    payClass() {
      if (this.totalPrice < this.minPrice) {
        return 'not-enough';
      } else {
        return 'enough';
      }
    },
    listshow() {
      if (!this.totalCount) {
        this.fold = true;
        return false;
      }
      let show = !this.fold;
      if (show) {
        this.$nextTick(() => {
          if (!this.scroll) {
            this.scroll = new BScroll(this.$refs.listfood, {
              click: true
            });
          } else {
            this.scroll.refresh();
          }
        });
      }
      return show;
    }
  },
  methods: {
    togglefold() {
      if (!this.totalCount) {
        return;
      }
      this.fold = !this.fold;
    },
    drop(el) {
      for (let i = 0; i < this.balls.length; i++) {
        let ball = this.balls[i];
        if (!ball.show) {
          ball.show = true;
          ball.el = el;
          this.dropBalls.push(ball);
          return;
        }
      }
    },
    beforeEnter(el) {
      let count = this.balls.length;
      while (count--) {
        let ball = this.balls[count];
        if (ball.show) {
          let ret = ball.el.getBoundingClientRect();
          let x = ret.left - 32;
          let y = -(window.innerHeight - ret.top - 22);
          el.style.display = '';
          el.style.transform = `translate3d(0,${y}px,0)`;
          el.style.webkitTransform = `translate3d(0,${y}px,0)`;
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.transform = `translate3d(${x}px,0,0)`;
          inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
        }
      }
    },
    enter(el) {
      /* eslint-disable no-unused-vars */
      let rf = el.offsetHeight;
      this.$nextTick(() => {
        el.style.transform = 'translate3d(0,0,0)';
        el.style.webkitTransform = 'translate3d(0,0,0)';
        let inner = el.getElementsByClassName('inner-hook')[0];
        inner.style.transform = 'translate3d(0,0,0)';
        inner.style.webkitTransform = 'translate3d(0,0,0)';
      });
    },
    afterEnter(el) {
      let ball = this.dropBalls.shift();
      if (ball) {
        ball.show = false;
        el.style.display = 'none';
      }
    },
    empty() {
      this.selectFoods.forEach((food) => {
        food.count = 0;
      });
    },
    hideList() {
      this.fold = true;
    },
    pay() {
      if (this.totalPrice < this.minPrice) {
        return;
      }
      window.alert(`支付${this.totalPrice}元`);
    }
  },
  components: {
    cartcontrol
  }
};
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import '../../common/stylus/mixin.styl'
  .shopcart
    position:fixed
    left:0
    bottom:0
    z-index:50
    width:100%
    height:48px
    .content
      display:flex
      background :#141d27
      font-size:0
      color:rgba(255,255,255,0.4)
      .content-left
        flex:1
        .logo-wrapper
          display:inline-block
          position:relative
          top:-10px
          margin:0 12px
          padding:6px
          width:56px
          height:56px
          box-sizing:border-border-box
          vertical-align:top
          border-radius:50%
          background:#141d27    
          .logo
            width:100%
            height:100%
            border-radius:50%
            text-align:center
            background:#2b343c
            &.highlight
              background:rgb(0,160,220)
            .icon-shopping_cart
              line-height:53px
              font-size:24px
              color:#80858a
              &.highlight
                color:#fff
          .num
            position:absolute
            top:0
            right:0
            width:24px
            height:16px
            line-height:16px
            text-align:center
            border-radius:16px
            font-size:9px
            font-weight:700
            color:#fff
            background:rgb(240,20,20)
            box-shadow:0 4px 8px 0 rgba(0,0,0,0.4)           
        .price
          display:inline-block
          vertical-align:top
          margin-top:12px
          line-height:24px
          padding-right:12px
          box-sizing:border-box
          border-right:1px solid rgba(255,255,255,0.1)
          font-size:16px
          font-weight:700
          &.highlight
            color:#fff
        .desc
          display:inline-block
          verticl-align:top 
          margin:12px 0 0 12px
          line-height:24px
          font-size:10px
      .content-right
        flex:0 0 105px
        width:105px
        .pay
          height:48px
          line-height:48px
          text-align:center
          font-size:12px
          font-weight:700
          background:#2b333b
          &.not-enough
            background:#2b333b
          &.enough
            background:#00b43c
            color:#fff
    .ball-container 
      .ball
        position:fixed
        left:32px
        bottom:22px
        z-index:200
        transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
        .inner
          width:16px
          height:16px
          border-radius:50%
          background-color:rgb(0,160,220) 
          transition: all 0.4s linear
    .cart-detail
      position: absolute
      left: 0
      top: 0
      z-index: -1
      width: 100%
      font-size: 0
      transition: all .5s
      transform: translate3d(0, -100%, 0)  
      &.fold-enter-active, &.fold-leave-active
        transition: all .5s
      &.fold-enter, &.fold-leave-to
        transform: translate3d(0, 0, 0)      
      .list-header
        height:40px
        width:100%
        box-sizing: border-box
        line-height:40px
        padding: 0 18px
        background: #f3f5f7;
        border-1px(rgba(7, 17, 27, 0.1))
        .left-text
          float: left
          font-size: 14px
          line-height: 40px
          color: rgb(7, 17, 27)
        .right-text
          float: right
          font-size: 14px
          color: rgb(0, 160, 220)
          line-height: 40px
      .list-food
        background-color: rgb(255, 255, 255)
        padding: 0 18px
        max-height: 217px
        overflow: hidden
        .select-item
          border-1px(rgba(7, 17, 27, 0.1))
          padding: 12px 0
          position: relative
          .name
            font-size: 14px
            color: rgb(7, 17, 27)
            line-height: 24px
          .price
            position: absolute
            top: 12px
            right: 110px
            font-size: 10px
            font-weight: 700
            color: rgb(240, 20, 20)
            line-height: 24px
          .cartcontrol-wrapper
            position: absolute
            right: 0
            top: 6px
  .openmask
    position:fixed
    top:0
    left:0
    width:100%
    height:100%
    z-index:40
    backdrop-filter:blur(10px)
    background-color:rgba(7,17,27,0.6)
    &.fade-enter-active, $fade-leave-active
      transition:all 0.5s
    &.fade-enter,&fade-leave-active
      background-color:rgba(7,17,27,0)          
</style>
